摘要
Ba星对重元素核合成及星系化学演化的研究都有非常重要的意义.Ba星的重元素是超丰的,但其光度太低,认为还未演化到AGB阶段,并且没有观测到99Tc核素.研究表明,Ba星应该属于双星系统,其重元素超丰来自双星吸积,它的伴星已经经历了S-过程核合成,而且由在以前发生的同其伴星(以前是AGB星,现已演化为白矮星)的质量传输过程中,从伴星那里获得了富含重元素的物质,这样造成了Ba星的重元素超丰.
It is very significant for Ba stars to heavy-element nucleosfynthesis and galactic chemical evolution. The obvious overabundance of heavy-element is observed in Ba stars. However,the luminosity of Ba stars is too low to reach AGB stage,and the nuclear 99Tc has not observed in Ba stars. In general,Ba stars belong to binary system,and their heavy-element overabundance are due to the accreting material from the companions(the former TP-AGB stars and the present white dwarfs).
出处
《河北师范大学学报(自然科学版)》
CAS
2003年第1期34-37,共4页
Journal of Hebei Normal University:Natural Science
基金
国家自然科学基金资助项目(19973002)